Westfarmers and SOL are 2 companies I'd buy as well but they...

Westfarmers and SOL are 2 companies I'd buy as well but they look fairly over priced at the moment. I own Telstra on top of my LIC holdings but my LIC love has grown because of the constant and reliable dividends. I'm just not sure if it is the right path to go down to be able to retire in 20 years at the ripe old age of 50. The long haul, and conservative, investor approach! I've been reading a lot of how Thornhill invests and he is all about LICs for dividend investing. I guess that has struck a chord with me but am open to learning other approaches! Any recommended readings for building a portfolio?